Created
October 18, 2017 12:34
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How to use regl in React or React Native
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import React, { PureComponent } from "react"; | |
import { StyleSheet } from "react-native"; | |
import ReglView from "./ReglView"; | |
import mat4 from "gl-mat4"; | |
import bunny from "bunny"; | |
export default class Bunny extends PureComponent { | |
drawCommand = regl => { | |
return regl({ | |
vert: ` | |
precision mediump float; | |
attribute vec3 position; | |
uniform mat4 model, view, projection; | |
void main() { | |
gl_Position = projection * view * model * vec4(position, 1); | |
}`, | |
frag: ` | |
precision mediump float; | |
void main() { | |
gl_FragColor = vec4(1, 1, 1, 1); | |
}`, | |
// this converts the vertices of the mesh into the position attribute | |
attributes: { | |
position: bunny.positions | |
}, | |
// and this converts the faces of the mesh into elements | |
elements: bunny.cells, | |
uniforms: { | |
model: mat4.identity([]), | |
view: (_, { angle }) => { | |
return mat4.lookAt( | |
[], | |
[30 * Math.cos(angle), 2.5, 30 * Math.sin(angle)], | |
[0, 2.5, 0], | |
[0, 1, 0] | |
); | |
}, | |
projection: ({ viewportWidth, viewportHeight }) => | |
mat4.perspective( | |
[], | |
Math.PI / 4, | |
viewportWidth / viewportHeight, | |
0.01, | |
1000 | |
) | |
} | |
}); | |
}; | |
clearCommand = regl => { | |
return props => { | |
regl.clear({ | |
depth: 1, | |
color: [0, 0, 0, 1] | |
}); | |
}; | |
}; | |
render() { | |
return ( | |
<ReglView | |
style={StyleSheet.absoluteFill} | |
drawCommand={this.drawCommand} | |
clearCommand={this.clearCommand} | |
{...this.props} | |
/> | |
); | |
} | |
} |
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import React, { PureComponent } from "react"; | |
import { WebGLView } from "react-native-webgl"; | |
import REGL from "regl"; | |
export default class ReglView extends PureComponent { | |
constructor() { | |
super(); | |
this.state = {}; | |
} | |
onContextCreate = gl => { | |
const regl = REGL(gl); | |
const rngl = gl.getExtension("RN"); | |
const clear = this.props.clearCommand(regl, rngl); | |
const draw = this.props.drawCommand(regl, rngl); | |
this.setState({ | |
frame: props => { | |
clear(props); | |
draw(props); | |
rngl.endFrame(); | |
} | |
}); | |
}; | |
render() { | |
if (this.state.frame) this.state.frame(this.props); | |
return ( | |
<WebGLView | |
style={this.props.style} | |
onContextCreate={this.onContextCreate} | |
/> | |
); | |
} | |
} |
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